}

  private static ImmutableSet<Field> httpHeadersFields() {
    ImmutableSet.Builder<Field> builder = ImmutableSet.builder();
    for (Field field : HttpHeaders.class.getDeclaredFields()) {
      /*
       * Coverage mode generates synthetic fields.  If we ever add private
       * fields, they will cause similar problems, and we may want to switch
       * this check to isAccessible().
       */

        assertEquals(message, exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test
    public void testSerialVersionUID() {
        assertNotNull(CurlException.class.getDeclaredFields());
        boolean hasSerialVersionUID = false;
        try {
            CurlException.class.getDeclaredField("serialVersionUID");
            hasSerialVersionUID = true;
        } catch (NoSuchFieldException e) {